I have a code but it keeps sending this erreur message : Error: File: moo_object​ive_functi​ons.m Line: 4 Column: 89 Invalid expression. When calling a function or indexing a va

Here's the code :

1. function f = moo_objective_functions (x)
2. dispo = x(1) ; rule = x(2); iat= x(3) ; bs =x(4) ;
4. f(1) = 144633 - [(13633* bs) - (5742.6 *iat) - (68028* rule) - (71627* dispo) + (542.4 *
5. bs*iat) + (6511* bs*rule) + (6809 *bs*dispo) + (2721.8 *iat*rule) + (2845.2* iat*dispo)
6. + (33807* rule*dispo) - (260.52* bs*iat*rule) - (269.48 *bs*iat*dispo) - (3235.7
7. *bs*rule*dispo) - (1352.5 *iat*rule*dispo) + (129.46* bs*iat*rule*dispo)] ;
9. f(2) = -[-61.61 + 9.883* bs + 4.1508* iat + 2.415* rule + 98.713* dispo -
10. (0.50632* bs*iat)- (9.4912* bs*dispo) - (0.0971* iat*rule) - (3.9333 *iat*dispo) -
11. (1.116* rule*dispo)+ (0.37771* bs*iat*dispo) + (0.0448* iat*rule*dispo)] ;
13. end

and this is the 2 erreur messages :

Error: File: moo_objective_functions.m Line: 4 Column: 89

Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched

delimiters.

Error: File: moo_objective_functions.m Line: 4 Column: 89

Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched

delimiters.

Answer 1

[Harshavardhan]

Hi @Mohamed Boubaker

The error messages you're encountering suggest that there is a problem with the syntax in your MATLAB code, specifically with the use of brackets and parentheses.  When splitting a statement across multiple lines in MATLAB, use the ellipsis ” ... “ to indicate that the statement continues on the next line. The code with the correct syntax is given below:

function f = moo_objective_functions (x)  
dispo = x(1) ; rule = x(2); iat= x(3) ; bs =x(4) ; 

f(1) = 144633 - ((13633* bs) - (5742.6 *iat) - (68028* rule) - (71627* dispo) + (542.4 * bs*iat) ... 
    + (6511* bs*rule) + (6809 *bs*dispo) + (2721.8 *iat*rule) + (2845.2* iat*dispo) ... 
    + (33807* rule*dispo) - (260.52* bs*iat*rule) - (269.48 *bs*iat*dispo) - (3235.7*bs*rule*dispo) ... 
    - (1352.5 *iat*rule*dispo) + (129.46* bs*iat*rule*dispo)) ; 

f(2) = -(-61.61 + 9.883* bs + 4.1508* iat + 2.415* rule + 98.713* dispo ...  
    - (0.50632* bs*iat)- (9.4912* bs*dispo) - (0.0971* iat*rule) - (3.9333 *iat*dispo) ... 
    - (1.116* rule*dispo)+ (0.37771* bs*iat*dispo) + (0.0448* iat*rule*dispo)) ; 

end 

For more information on ellipsis in MATLAB, you can refer to the following link:

https://www.mathworks.com/help/matlab/ref/ellipsis.html